/*
 moxl - Modular XML Library
 Copyright (c) 2007, Malcolm Sparks

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package moxl.parser.markup.states;

import moxl.parser.ParserException;
import moxl.parser.assemblers.comment.CommentAssembler;
import moxl.parser.assemblers.openelement.OpenElementAssembler;
import moxl.parser.markup.Markup;
import moxl.parser.markup.types.OpenElementTagMarkup;
import moxl.parser.markup.types.WhitespaceMarkup;
import moxl.tokenizer.Token;
import moxl.tokenizer.TokenStream;
import moxl.tokenizer.TokenizerException;
import moxl.tokenizer.xml.XmlTokenType;

public class PostXmlDeclStateDelegate implements XmlDocumentParserStateDelegate
{
	public Markup parseNextMarkupFromStream(TokenStream tstream, XmlParserContext ctx) throws ParserException, TokenizerException
	{
		Token nextToken = tstream.lookahead(1);

		switch ((XmlTokenType) nextToken.getType())
		{
		case OPEN_CHEVRON_EXCLAMATION_MARK:
			Token tokenAfterNext = tstream.lookahead(2);
			if (tokenAfterNext.getType().equals(XmlTokenType.NAME) && tokenAfterNext.getImage().equals("DOCTYPE"))
			{
				throw new UnsupportedOperationException("This xml parser does not understand DOCTYPE decls.");
			}
			else
			{
				throw new ParserException("Illegal token: " + tokenAfterNext, tokenAfterNext.getLocation());
			}

		case OPEN_COMMENT:
			// We're dealing with a comment, which is allowed at this stage, but it puts us in the post xml-decl state.
			return new CommentAssembler().assembleMarkupFromStream(tstream);

		case OPEN_CHEVRON:
			OpenElementTagMarkup markup = (OpenElementTagMarkup) new OpenElementAssembler().assembleMarkupFromStream(tstream);
			if (markup.isEmpty())
			{
				// That's our document element read, so we are in postamble
				ctx.changeState(XmlParserState.POSTAMBLE);
			}
			else
			{
				ctx.changeState(XmlParserState.ELEMENT_CONTENT);
			}
			return markup;

		case SPACE:
		case WHITESPACE:
			return new WhitespaceMarkup(tstream.read());

		default:
			throw new ParserException("Illegal token: " + nextToken, nextToken.getLocation());
		}

	}
}
